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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f0a7edc6c0b3ea45d27cc1e9a03f59399616e83156d68d71f7ef7ed5c41b03' 
  AND token = 'CkOKofe4BPoRPItprf52LgFvkdSm/2Q4Au2/zdofO/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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