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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafd1a8b85b414e7c70f72323920e1b1d9014c773ea8610d5cc19fea30d756b8' 
  AND token = 'EIejwCQTyUegXSqyThh/Eh4iUdzDdq8kOmGdF1Ode2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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