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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f439dcde105b6168d4f4de3ce203175f3162de6da7e9048d4fb42d0abc463f12' 
  AND token = '6NbFSwLl2uhvT6kJe1HOyboUzO139P2sush9QeLMjCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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