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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9574bdecfa237a9fa0f0c10bedaa79d80ee6c12a2871bf52d9deed3367f017b2' 
  AND token = 'GQDwFrBL//0n63a/O8ZeB2py826jvgg+cT6lKaLHm/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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