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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a30d78245f79c6d5b1465ec619d45aa63146665409ba697d0366600b612454a' 
  AND token = 'E1YqxSuoO/V2fHE4/yqpOufr7DEf8mn90WkuSnywVB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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