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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c284889ed4418f26d89aa23b809f3a106a9e8e298e95d9fc29f74bda1c17fbcc' 
  AND token = 'VHnV6C46XFGVOuR1qJXuilIjaJ2p10aSZGkeDLQ5L0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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