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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8bcdff03d5d5ef623b64ba96c31062f76de135ba32f628598a33a35c2d4595' 
  AND token = '06jGcvS1bA8L9Y+Zp5QApNFLOZ/lXlgItMUdwYaAwp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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