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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed791ac582467490a0bf8a29a27d15afc04bc966a15bb9fb7e76c8c0fea5470f' 
  AND token = 'AirFRqmI8CD6SkokX1Bcq45Pl3vNVfgPpWHjg2qn//w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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