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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7089f6228b046cafa038ef1b04ea20c5db1d21a99a369a9e2cbbd94ed36a077' 
  AND token = 'F3vZXwefMO79iW/jkh3oNDvSSECFTwAy4oqk51Tn+aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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