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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463303088d14424ea6dd7c651b0da6d7579bf3d66ed4e67468ed50fd8831530c' 
  AND token = 'r7vTcGF+g/nrFRm0usQHkmw0ReKZ0RbbxqcFY4+0Plo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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