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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d24a85a5c0b0172afd7a62e1e7946a25560fd624954a724de47ed3c3a2e952c' 
  AND token = 'JpFG+VXvDMhQ+qAcRgsmfO07DAJYIT3m9O85Mmxsnrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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