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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe674a3b89e247c4ba7ec84eb2e0d0771f0839ec9d08be62c4e6abc839b3c07c' 
  AND token = 'uUjHBLqu3/O/zMF3wGD2SgyWVNQXzbViJWjZ8XbJOZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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