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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b519827c62fd8dbf973d4c75f0e2438e19bd5275329b2ef3e2379b106f9bc3f' 
  AND token = 'Zqte7Gk97rnZofmyCq4WnwFbphiRnCVyO0KavR7ROXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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