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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037cc5bf70a2796c996b4c1fc650d3ccd51e54fb455c6255e01db9717cb081c5' 
  AND token = 'rYHo2Yi6gA/2/y8xd0yFrxhQfQXhtUdc18BIgoRAef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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