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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b269b3469dadee58b48932ea1a168aa34480a7dc8594ffa5c04e9ad866d0ed2d' 
  AND token = 'YEF4HrNfq+JMxFqN+aleDqUZv99H/ZeprZK8W6sRXME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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