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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b337a6b0c89d1970f6213778a43c6b091cff3612f95cd53859b0aea7bb73eb' 
  AND token = 'qx4/oNkP92iSBndZgYkPc5/9WFehiiWMzOdOvU/mchQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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