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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9a828755fd6a9fd20d8c75081b2ee7896fe0713ca4aa43ea161f2b4881b3d0' 
  AND token = 'VWsn4tVb3CMkjRrVLtjqQIID9TfA8I2yBM/x0iIwAhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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