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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c26d2634cfa65a2a4cb80697b5bb70b09833ebfb6ffe572d16394f30b72d20' 
  AND token = 'GnDNs63ztYFGk+FOBnbRBFVQ4Jud9o41/r0mrJpDLkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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