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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f71bb05ef9a5e7fcc76a53892cd72c02c00cd45dd013ec70058f47450dc44e' 
  AND token = 'vN8BKPdefN9VFkJUoGGzRYhVrXzDXZmwV095uXVSSzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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