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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30d1db2a7c47c37c0cf76af223cd3fe9cf0ab92aa5f1e255d1de9c5780cabf2' 
  AND token = 'B7bnmjYJz9vncavDvXOrn0fN72ngxS8W/FhUzz+TBX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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