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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ee5c80f2bfbc2befe8f09c2874fefc8f555fe803bba60ece531608c59a25a9' 
  AND token = 'na7u3ZLGhdIcYHF0NpYkt9pLLa7CyWuPqJ1YP1CkJzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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