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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d391015bcf936526c3779b82df058f1a351f3cf71d2213803a84476adf90d27' 
  AND token = 'TkvQcO5kmUJJVpRm9ZBtAa0FT8kpmiRM+4y3jnKx1E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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