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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b5a5b8422da5ba7f7ddcdaa67ed61dd6d47851a016ee7625a85e0e0adc2d4e' 
  AND token = 'lGswJ402Sog9/oiHgW/RDJL8cse3nOeci7pE5wQRgHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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