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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb8eb5c500f147723e63b45ba0352c96aec7a69694c50c6a013ff6acccbf675' 
  AND token = 'l2eY3TLZX0IV31RS4BNppJg7VQRLunSy8lnqYHCdYq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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