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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e43c2613d8a8da3b7750390cbcaf54a6e0392620133947c473b86b92bffc0a' 
  AND token = '2v9jsXWnC7xPpKadIF/eC1eAKfB2w0pOcfdqMewACS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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