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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7f904abd5e41e65dd50849f657ea4c0143848c600cd42fe996d6a8b3fdb54d' 
  AND token = 'xZyt8zJQhmbM848+jIYy6zYW58Vftk2rfoohphaNtUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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