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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ecaa036649b145f2d910c33d41e5dc34b78d5259afe446249491506d8d7e8b' 
  AND token = 'aVDnyQZARJCZJS550OTWescloRZ3U6ixs+g7Eh2Tsy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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