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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e603f22301bda89188ba4b85cc37f90301714cd0a69b839814a5223ddfac2a71' 
  AND token = '33Qua2xZq7Vfh1VFabq4eWMf/bczLl37l49ohZKJP7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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