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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66d1f27c35d8783569c018c27a06f856743fc6ced441421f2c7e83500864101' 
  AND token = 'TTz0bsarneQz85hQHUUffldbTC8Cod5DjpHpdE+Fzs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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