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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784f57c94ace0088e4b8d804fb578e1260e2fe0df167250ec5e32586cf196ed9' 
  AND token = 'gyr0yK60fbAsqkCWfrl9OnCDQi5aFC3rvkVZPXYsX/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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