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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48176e65aeb1e11fca11ed78c520d5177d768bb4153d586113c7e8ff6b0aee9c' 
  AND token = 'CtQIA3qmSRpOeYA/l+SgwRvyCY0Hjf0hkRXXlEdbkbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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