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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd331f36a3a3a284a3c722490c98862f746509be40e0ab62b7de921af002eaed3' 
  AND token = '8ldyByVGmyE+NogOsLQhkH3CsotwR27jj8Rd83sYJ3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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