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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4b608065d73075d3133131529a42f9a1383de87ccb5dcdcec813e257abb6ee' 
  AND token = 'bmvJvbmmv2KDt8n4kBoQY8EhZpJ6bg2Thguwx50v6ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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