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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f23f38e45c495263c0e11938fa2427c3904bfa4c351e240ac9d58690681291d' 
  AND token = 'YI4MQ/wzFsIdmGDYM9If2/oH8j/ec+yxhiK/3FXi+jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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