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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151ae906d317104b6bd618f7b9a6085bfba99e62a6d403db02e6b3b7276da3c5' 
  AND token = '/NfX7BCK3UlO+lJSJ9iW4uXSRA/h0QOKXY4BOQrhPH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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