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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ada34970d625a07fcaa749922f2ea3f391a0ec43dc943dd63ec04352cdc4660' 
  AND token = 'blbIptdmkBv4sb7jUiIpYcpdi6pjgQxP0e3AiR0A66Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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