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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10fccada2ef42b9b77912c82e01aeb6cd00ece5c694639e25fb70c8babff367e' 
  AND token = 'F1JWt0uo4z7nvblZAT08IpEkGitgkg0M1b887mdE6Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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