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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acf6a19a8fef007688c5bcb1e395cfad7be8e93e388421585031dc1c571ab1c' 
  AND token = 'oAtvmpje7IOfVvq2VNab13qnA4lwLgBJ0+ojrD9pMKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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