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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ab84563b296045b98597c67c7b41f4d3ec091673dbe2d7b2c7285aa53a854c' 
  AND token = 'LFSJe4xT/BvpcS2bF3YpOpLFMWwtN0wRa8hl59cyrqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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