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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373ed695c47c2fafd7da2ce8f5aa93df16b3af5cb0a923c50d2b91dc80837ac2' 
  AND token = '5BFZsQtYLojvRd53d1D3YZtMgfjmnAvxQCU7bUcTUJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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