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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f469a9cfc4d75fdac8d22e37ee5d0fd8363f3a75d7b36243c437085f9bdc559c' 
  AND token = '5D9z14AXHffLtHVFxWCzA/OW4I/vmod7S7KR9JMNMP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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