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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42249d3226c4f47a9731345815720a4bac05021fe383b7a019515c4cdc90255c' 
  AND token = '9DZ2m5hflRrBKAZgBqlAJU569epQaf+37aXNNwfqCB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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