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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a947cc81d12fc3a85bf24c2b8556de34d30ac61b0f0fc78ec8467416c2b2e1d4' 
  AND token = 'Nxln4Uk34/uNDC/UFoMOxj01QYdcqMbLea/W2sK5o4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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