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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bee261afdc97d2997d3c3da731f4109c12ba4c9b7f2cc4f380dcfaa5d6d946' 
  AND token = 'xAHOcl4u53aZPTqA/DSQR/m/zPo2bMzL+UfskIHPJk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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