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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ef19292561dc15b838d0fdff8b0f0dc405398ed0864e879dea6ae5f6c25396' 
  AND token = 't3fgkw+XaUavh7QFu+dWnHPkbXZmXpKFASHUblJ3M+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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