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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1db283310b6e2bc47ec6a366e157086bc692d1af346eafe348ce8ef8aae6397' 
  AND token = 'OBsAXVH4hCxFxMY2xOdGW0UNjAf9IIoft2AGHMLPMXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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