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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6feebbb9077b8ec2f6bb3858ea2ae01d2a9a6b66f57caef106cb5204f3d16c9c' 
  AND token = 'Psbt94UHqH1Y5tlVGar9S6QqZSzdZ8w29vnqKP9DZvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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