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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e46116ebeac110d54ff5d840d4dfb3354d895bdcb35e09feb610910956aada8' 
  AND token = 'EbBHvCtKEsIkRb5OJfzS3kiV+xyYSeisSE21rmqja3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}