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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1f03f59fe44f2099ec82cc9abe52761a6943755d8bf4c2f1b08b0ee5dfec7e' 
  AND token = 'wnmpgSJ9zZyvNp+pJwVtioxdv2d1iqILCEpJXT5nRcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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